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<h2><a name="SECTION009330000000000000000"></a>
<a name="mailbox-deprecated"></a>
<br>
7.3.3 Exceptions
</h2>

<p>
The following exception classes are defined in the <tt class="module">mailbox</tt> module:

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-1447' xml:id='l2h-1447' class="class">Error</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
The based class for all other module-specific exceptions.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-1448' xml:id='l2h-1448' class="class">NoSuchMailboxError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Raised when a mailbox is expected but is not found, such as when instantiating
a <tt class="class">Mailbox</tt> subclass with a path that does not exist (and with the
<var>create</var> parameter set to <code>False</code>), or when opening a folder that does
not exist.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-1449' xml:id='l2h-1449' class="class">NotEmptyErrorError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Raised when a mailbox is not empty but is expected to be, such as when deleting
a folder that contains messages.
</dl>

<p>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-1450' xml:id='l2h-1450' class="class">ExternalClashError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Raised when some mailbox-related condition beyond the control of the program
causes it to be unable to proceed, such as when failing to acquire a lock that
another program already holds a lock, or when a uniquely-generated file name
already exists.
</dl>

<p>
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  <td><nobr><b><span class="typelabel">class</span>&nbsp;<tt id='l2h-1451' xml:id='l2h-1451' class="class">FormatError</tt></b>(</nobr></td>
  <td><var></var>)</td></tr></table></dt>
<dd>
Raised when the data in a file cannot be parsed, such as when an <tt class="class">MH</tt>
instance attempts to read a corrupted <span class="file">.mh_sequences</span> file.
</dl>

<p>

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